Add test cases for WP version resolver

Author: thelovekesh

tests/test-wp-version-resolver.php

@@ -0,0 +1,83 @@
+<?php
+
+use WP_CLI\Utils;
+use WP_CLI\Tests\TestCase;
+
+class WPVersionResolverTest extends TestCase {
+
+	private $temp_file;
+
+	protected function set_up() {
+		parent::set_up();
+
+		$this->temp_file =  Utils\get_temp_dir() . 'wp-cli-tests-wp-versions.json';
+
+		$fp = fopen( $this->temp_file, 'w' );
+		fwrite( $fp, json_encode( $this->wp_versions_data() ) );
+		fclose( $fp );
+	}
+
+	protected function tear_down() {
+		if ( $this->temp_file && file_exists( $this->temp_file ) ) {
+			unlink( $this->temp_file );
+		}
+
+		parent::tear_down();
+	}
+
+	private function wp_versions_data() {
+		return array(
+			'5.9' => 'insecure',
+			'5.9.1' => 'insecure',
+			'5.9.2' => 'insecure',
+			'6.0' => 'insecure',
+			'6.0.1' => 'insecure',
+			'6.0.2' => 'insecure',
+			'6.1' => 'insecure',
+			'6.1.1' => 'insecure',
+			'6.1.2' => 'insecure',
+			'6.2' => 'insecure',
+			'6.2.1' => 'insecure',
+			'6.2.2' => 'insecure',
+			'6.5' => 'insecure',
+			'6.5.2' => 'latest',
+		);
+	}
+
+	private function data_wp_version_resolver() {
+		return array(
+			array( '5.0', '5.0' ), // Does not match any version. So return as it is.
+			array( '5', '6.5.2' ), // Return the latest major version.
+			array( '5.9', '5.9.2' ), // Return the latest patch version.
+			array( '5.9.1', '5.9.1' ), // Return the exact version.
+			array( '6', '6.5.2' ), // Return the latest minor version.
+			array( '6.0', '6.0.2' ), // Return the latest patch version.
+			array( '6.0.0', '6.0' ), // Return the requested version.
+			array( '', '6.5.2' ), // Return the latest version.
+			array( 'latest', '6.5.2' ), // Return the latest version.
+			array( 'some-mismatched-version', 'some-mismatched-version' ), // Does not match any version. So return as it is.
+			array( '6.5-alpha', '6.5.2' ), // Return the latest version.
+			array( '6.5-beta', '6.5.2' ), // Return the latest version.
+			array( '6.5-rc', '6.5.2' ), // Return the latest version.
+			array( '6.5-nightly', '6.5-nightly' ), // Does not match any version. So return as it is.
+			array( '6.5.0.0', '6.5' ), // Return the latest version.
+			array( '6.5.2.0', '6.5.2' ), // Return the latest version.
+		);
+	}
+
+	/**
+	 * @dataProvider data_wp_version_resolver
+	 */
+	public function test_wp_version_resolver( $env, $expected ) {
+		if ( $env ) {
+			putenv( "WP_VERSION=$env" );
+		}
+
+		$output = exec( 'php ' . dirname( __DIR__ ) . '/utils/wp-version-resolver.php' );
+
+		$this->assertEquals( $expected, $output );
+
+		// Reset the environment variable.
+		putenv( 'WP_VERSION' );
+	}
+}